<template>
  <header class="header">
    <h1>todos</h1>
    <input
      id="toggle-all"
      class="toggle-all"
      type="checkbox"
      v-model="isAll"
    >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      @keydown.enter="addFn"
      v-model.trim="taskName"
    />
  </header>
</template>

<script>
export default {
  props: ['list'],
  data() {
    return {
      taskName: ''
    }
  },
  methods: {
    addFn() {
      if(!this.taskName.length) return alert()
      this.$emit('addFn', this.taskName)
      this.taskName = ''
    }
  },
  computed: {
    // 全选小选
    isAll: {
      set(val) {
        this.list.forEach((item) => (item.isDone = val))
      },
      get() {
        return this.list.length ? this.list.every((item) => item.isDone) : false
      }
    }
  }
}
</script>